<h1 id='header1'>Header 1</h1>

<h2 id='header2'>Header 2</h2>

<h3 id='header3'>Header 3</h3>

<p>Then you can create links to different parts of the same document like this:</p>

<p><a href='#header1'>Link back to header 1</a>, <a href='#header2'>Link back to header 2</a>, <a href='#header3'>Link back to header 3</a></p>
